perf: run 签名改 &Arc<CompiledModule>，顶层模块跨 run 共享——collect_flat_modules 顶层改 Arc::clone 消除逐 run 常量池深拷贝，全调用点 Arc 包装迁移

crates/oxide_vm/benches/call.rs

@@ -9,7 +9,7 @@ fn bench_call(c: &mut Criterion) {
     let js = "function fib(n) { if (n < 2) return n; return fib(n-1) + fib(n-2); } fib(15);";
     let alloc = oxide_parser::Allocator::default();
     let program = oxide_parser::parse(&alloc, js).expect("parse");
-    let module = Compiler::new().compile(&program).expect("compile");
+    let module = Arc::new(Compiler::new().compile(&program).expect("compile"));
 
     c.bench_function("call", |b| {
         b.iter_batched(

crates/oxide_vm/benches/coercion.rs

@@ -9,7 +9,7 @@ fn bench_coercion(c: &mut Criterion) {
     let js = "var x = \"42\"; var y = \"3.14\"; var r = 0; for (var i = 0; i < 5000; i++) { r += (+x) + (+y); } r";
     let alloc = oxide_parser::Allocator::default();
     let program = oxide_parser::parse(&alloc, js).expect("parse");
-    let module = Compiler::new().compile(&program).expect("compile");
+    let module = Arc::new(Compiler::new().compile(&program).expect("compile"));
 
     c.bench_function("coercion", |b| {
         b.iter_batched(

crates/oxide_vm/benches/dispatch.rs

@@ -9,7 +9,7 @@ fn bench_dispatch(c: &mut Criterion) {
     let js = "var x = 0; for (var i = 0; i < 10000; i++) { x = x + i - i * 2 + (i % 3); } x";
     let alloc = oxide_parser::Allocator::default();
     let program = oxide_parser::parse(&alloc, js).expect("parse");
-    let module = Compiler::new().compile(&program).expect("compile");
+    let module = Arc::new(Compiler::new().compile(&program).expect("compile"));
 
     c.bench_function("dispatch", |b| {
         b.iter_batched(

crates/oxide_vm/benches/gc_mark_sweep.rs

@@ -11,7 +11,7 @@ fn bench_gc(c: &mut Criterion) {
     let js = "var g = {}; for (var i = 0; i < 500; i++) { var obj = { x: i, y: i * 2 }; g[i] = obj; } g[\"x\"]";
     let alloc = oxide_parser::Allocator::default();
     let program = oxide_parser::parse(&alloc, js).expect("parse");
-    let module = Compiler::new().compile(&program).expect("compile");
+    let module = Arc::new(Compiler::new().compile(&program).expect("compile"));
 
     c.bench_function("gc_mark_sweep", |b| {
         b.iter_batched(

crates/oxide_vm/benches/property.rs

@@ -9,7 +9,7 @@ fn bench_property(c: &mut Criterion) {
     let js = "var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 }; var sum = 0; for (var i = 0; i < 10000; i++) { sum += obj.a + obj.b + obj.c + obj.d + obj.e; } sum";
     let alloc = oxide_parser::Allocator::default();
     let program = oxide_parser::parse(&alloc, js).expect("parse");
-    let module = Compiler::new().compile(&program).expect("compile");
+    let module = Arc::new(Compiler::new().compile(&program).expect("compile"));
 
     c.bench_function("property", |b| {
         b.iter_batched(